What is the purpose of this line in a header file?

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#pragma once

  • to restrict the use of its contents to only one source file
  • to tell the compiler that only one variable can be instantiated from the classes or types contained in this header file
  • to help the compiler finish faster by assuring that only one compiler pass is neccessary for the code included in this header file
  • to make the compiler parse that header file only once, even if it is included multiple times in the source
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